九年级英语全册 Unit 4 When was it invented Section A课件 鲁教版.ppt

unit4whenwasitinvented sectiona 1 2 3 4 5 1blistenandmatchtheinventionswiththedates a b e d c 18761885192719711976 a b e c d 1cpairwork a whenwasthetelephoneinvented b ithinkitwasinventedin1876 juliethompson battery operatedslippers chelsealanmon heatedicecreamscoop jaycecoziarandjamieellsworth shoeswithadjustableheels 2alistenandnumbertheinventionsintheorderthatyouhear 3 1 2 pairworkwhowasit weretheyinventedby itwas theywereinventedbychelsealanmon 3apairworkmakealistoffivehelpfulinventionsandfiveannoying planecomputerbikecartrain atomicbomb 原子弹 missile 导弹 rifle 步枪 chemicalweaponinstantglue 速干胶 3bpairworka whatdoyouthinkisthemosthelpfulinvention b ithinkthemosthelpfulinventionisthelightbulb a whyisthat b well itgivespeoplemoretimetoworkandplayeveryday a whatdoyouthinkisahelpfulinvention b ithinkitisthecar a whyisthat b well itmakesitpossibleforpeopletomovetodistantplacesfaster 4pairworkimagineyouareleftaloneonasmallislandinthesea ifyouareallowedtotakefiveinventionsalongwithyou whatwouldyoutake iwouldliketotakethefollowingswithme aknife aflashlight acellphone atelescopeandagun a i dliketohavearadiobecauseicouldlistentomusicallday b yes butthat snotgoingtohelpyouleavetheisland ithinkitwouldbebettertohave thepassivevoice被动语态英语中动词有主动语态和被动语态两种语态 主动语态表示主语是动作的执行者 被动语态表示主语是动作的承受者 在被动语态中动作的执行者有时用by短语表示出来 被动语态的构成 助动词be 及物动词的 过去分词am is are donewas were done 一般现在时 一般过去时 thepassivevoice被动语态被动语态的用法 不知动作执行者时 常用被动语态 e g mybikewasstolenyesterday thiscarismadeinamerica 2 不必要说出动作执行者时 常用被动语态 e g romewasnotbuiltinaday 3 为了突出强调动作的承受者时 常用被动语态 e g thousandsofbeachesarepolluted 污染 thepassivevoice被动语态主动语态变为被动语态的步骤 1 把原主动句中的宾语转换为被动语态的主语 2 把动词改为被动形式 即 be 过去分词 注意be动词要按新的主语的人称和数进行变化 时态要和原来的主动语态的时态保持一致 3 原来主动语态句中的主语 如果需要 就放在by后面以它的宾格形式出现 如果没有必要就可以省略 其他的成分 定语 状语 不变 句式也不能变 bellinventedthetelephonein1876 thetelephonewasinventedbybellin1876 thepassivevoice被动语态主动语态变被动语态的结构图 主语 谓语动词过去式 宾语 时间状语 主语 谓语动词的过去分词 宾语 时间状语 students bookp70 part4 homework 用所给动词的正确形式填空 1 thebike fix upbyxiaomingyesterday 2 sunglasses use forprotectingpeople seyes 3 apicture put upontheblackboard 4 french speak infrance 5 teenagerss